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Hello. My name is***** and I just read through your question.
In most cases, bloody watery stool is an indication of a bacterial infection. the only way to really no for sure is to have a stool sample sent to a lab for culture. your doctor can do this for you.
The light headedness when you go from sitting or lying down to standing is due to mild dehydration. It is likely that these two symptoms are connected. My recommendation is to have your doctor send a stool sample. Then this can be treated.
Hello I'm Dr Chip
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